Filled the car with super instead of premium... it says it requires premium... but i dont know if it matters... anyway... i just got it and have never filled it with premium. after getting home from about a 150 mile trip i saw some smoke coming from underneath the car. It also kind of smelled like burnt gas/oil. the smoke was a gray color, and there was hardly any there at all, you couldnt notice unless you were looking for it. Anyway, i am wondering if this somking was possibly due to the super gas, or if the smoking was due to some kind of oil or fluid leak. There arent stains on the driveway when i move the car around, so i dont think its a leak, but im not sure. Any info would help.